CN104794280A - Optimization method for machine tool foundation bolt layout - Google Patents
Optimization method for machine tool foundation bolt layout Download PDFInfo
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- CN104794280A CN104794280A CN201510191344.XA CN201510191344A CN104794280A CN 104794280 A CN104794280 A CN 104794280A CN 201510191344 A CN201510191344 A CN 201510191344A CN 104794280 A CN104794280 A CN 104794280A
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- lathe bed
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- anchor bolt
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005457 optimization Methods 0.000 title claims abstract description 14
- 238000011156 evaluation Methods 0.000 claims description 7
- 238000004088 simulation Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 description 5
- 241001416181 Axis axis Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
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Abstract
The invention discloses an optimization method for machine tool foundation bolt layout. The method comprises the following steps that firstly, the quantity and the separation distance of machine tool foundation bolts are set; secondly, the deformation quantity of an intermediate point of a workbench is calculated when the workbench and workpieces are located on all positions of a machine tool body, the maximum deformation quantity and the minimum deformation quantity of the intermediate point of the workbench are selected when the workbench and the workpieces are located on all the positions of the machine tool body, and the result of subtracting the minimum deformation quantity by the maximum deformation quantity serves as the straightness accuracy error delta of the horizontal shaft axis movement of the machine tool body; thirdly, optimization is performed by taking the straightness accuracy error delta of the horizontal shaft axis movement of the machine tool body as an objective function and taking the separation distance and the quantity of the foundation bolts as independent variables, then the corresponding separation distance and quantity of the foundation bolts are obtained when the straightness accuracy error delta of the horizontal shaft axis movement of the machine tool body is minimum, and the machine tool foundation bolt layout is performed according to the separation distance and the quantity of the foundation bolts. According to the optimization method for the machine tool foundation bolt layout, the corresponding machine tool foundation bolt layout can be obtained when the straightness accuracy error of the horizontal shaft axis movement of the machine tool body is minimum.
Description
Technical field
The invention belongs to Machine Tool design technical field, relate to a kind of optimization method, be specifically related to a kind of optimization method of machine anchor bolt layout.
Background technology
The profile errors of workpiece derives from the relative pose error between the cutter of numerically-controlled machine and workpiece, and lathe bed transverse axis axis verticality is the important precision index affecting relative pose error between cutter and workpiece.But by the effect of worktable and workpiece gravity, lathe bed system can deform, especially when worktable moves along bed ways, center of gravity constantly changes, and finally affect lathe bed transverse axis axis straightness error, the layout of foot bolt is the appreciable impact factor of this error.
At present, domestic Machine Tool Enterprises substantially all designs foot bolt layout by experience, once in a while by finite element simulation method, analyzes, show that lathe bed is out of shape minimum a kind of layout for several conventional foot bolt layout.But these alternate layout remain and provide based on experience, optimum placement scheme can not reflected.Simultaneously, only consider the distortion of lathe bed, do not consider that workbench portion moves the change of the lathe bed worktable part center of gravity caused, and the change of center of gravity is the main cause causing the straightness error of transverse axis axial-movement to become large, only ensure that the less straightness error of transverse axis axial-movement that may not make of lathe bed distortion meets design requirement, the follow-up straightness error probably still needed by process guarantee lathe bed transverse axis axial-movements such as scraping guide pass, efficiency of assembling is low, also produces expense unnecessary in a large number simultaneously.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of optimization method of machine anchor bolt layout, the layout of foot bolt corresponding when the straightness error of the method acquisition lathe bed transverse axis axial-movement is minimum.
For achieving the above object, the optimization method of machine anchor bolt layout of the present invention comprises the following steps:
1) quantity and the spacing of machine anchor bolt are set;
2) worktable and workpiece are placed into lathe bed diverse location, the deflection of worktable intermediate point when evaluation work platform and workpiece are in lathe bed each position, choose again worktable and workpiece in lathe bed each position time the maximum deformation quantity of worktable intermediate point and least amount of deformation, the result of then being subtracted each other by maximum deformation quantity and the least amount of deformation of worktable intermediate point when worktable and workpiece are in lathe bed each position is as the straightness error δ of lathe bed transverse axis axial-movement;
3) with the straightness error δ of lathe bed transverse axis axial-movement for objective function, with the spacing of foot bolt and quantity for independent variable is optimized, the straightness error δ of lathe bed transverse axis axial-movement minimum time corresponding anchor bolt pitch and quantity, time then minimum according to the straightness error δ of lathe bed transverse axis axial-movement, corresponding anchor bolt pitch and quantity carry out the layout of machine anchor bolt.
Step 3) in the spacing of foot bolt comprise along the spacing in rail length direction and the spacing along lathe bed Width.
Step 2) in by the deflection of worktable intermediate point when the method evaluation work platform of finite element simulation and workpiece are in lathe bed each position.
The present invention has following beneficial effect:
The optimization method of machine anchor bolt layout of the present invention is in optimizing process, by worktable and workpiece are placed into the different position of lathe bed, the straightness error of lathe bed transverse axis axial-movement corresponding when calculating quantity and the spacing of different machine anchor bolt, then choose the straightness error of lathe bed transverse axis axial-movement minimum time corresponding anchor bolt pitch and quantity, be different from the method that current Machine Tool Enterprises obtained by experience and carry out foot bolt layout, thus the straight line error of machine tool horizontal axle axial-movement is minimum after making layout, ensure the linearity of lathe bed transverse axis axial-movement.
Accompanying drawing explanation
Fig. 1 is the structural representation of precise forming gear-grinding machine in embodiments of the invention one;
Fig. 2 is the schematic diagram in the straightness error computation process of X-axis axial-movement in embodiments of the invention;
Fig. 3 is the layout of foot bolt after optimizing in embodiments of the invention one.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
The optimization method of machine anchor bolt layout of the present invention comprises the following steps:
1) quantity and the spacing of machine anchor bolt are set;
2) worktable and workpiece are placed into lathe bed diverse location, the deflection of worktable intermediate point when evaluation work platform and workpiece are in lathe bed each position, choose again worktable and workpiece in lathe bed each position time the maximum deformation quantity of worktable intermediate point and least amount of deformation, the result of then being subtracted each other by maximum deformation quantity and the least amount of deformation of worktable intermediate point when worktable and workpiece are in lathe bed each position is as the straightness error δ of lathe bed transverse axis axial-movement;
3) with the straightness error δ of lathe bed transverse axis axial-movement for objective function, with the spacing of foot bolt and quantity for independent variable is optimized, the straightness error δ of lathe bed transverse axis axial-movement minimum time corresponding anchor bolt pitch and quantity, time then minimum according to the straightness error δ of lathe bed transverse axis axial-movement, corresponding anchor bolt pitch and quantity carry out the layout of machine anchor bolt.
Step 3) in the spacing of foot bolt comprise along the spacing in rail length direction and the spacing along lathe bed Width.
Step 2) in by the deflection of worktable intermediate point when the method evaluation work platform of finite element simulation and workpiece are in lathe bed each position.
It should be noted that, worktable and workpiece are placed into successively uniformly the diverse location of lathe bed, and the spacing between each position is 200-300mm.
Embodiment one
(1) under foot bolt initial layout mode, the straightness error of lathe bed transverse axis axial-movement calculates, the structure diagram of certain precise forming gear-grinding machine existing as shown in Figure 1, foot bolt is that two row are arranged, initial designs quantity is 12, X to initial separation value be 500mm, the initial separation value of Y-direction is 1500mm.In the present embodiment, Y-direction spacing is little on the impact of the straightness error δ of transverse axis axial-movement, therefore only considers X to spacing and foot bolt quantity to the impact of the straightness error of X-axis axial-movement.With reference to figure 2, by the motion process of pillar parts on bed ways slide block, regard pillar parts as along the some positions of guide rail at lathe bed length direction.By the deflection δ of finite element simulation method evaluation work platform Action of Gravity Field lower table intermediate point when each position
i.Maximal value in these deflections subtracts the straightness error δ that minimum value is transverse axis axial-movement.In an embodiment, can calculate under initial foot bolt quantity and spacing, the straightness error of X-axis axial-movement is 8.96 μm/total length.And the straightness error of technological requirement Z axis axial-movement is 5 μm/total length, therefore, initial layout's mode of foot bolt is unreasonable.
Employing the present invention be optimized, with the straightness error δ of Z axis axial-movement for objective function, with the spacing of length direction and foot bolt quantity for independent variable, in conjunction with ANSYS Finite Element Simulation Analysis, the layout of Optimized Iterative algorithm to foot bolt is adopted to be optimized.Table 1 and table 2 sets forth the single-row quantity of foot bolt be 5 and 6 time X-axis axial-movement straightness error value.Choose optimum foot bolt layout according to table 1 and table 2, namely foot bolt quantity is 10, and length direction spacing is 704mm, and Width spacing is 1500mm, and optimum results as shown in Figure 3.
Table 1
Table 2
Claims (3)
1. an optimization method for machine anchor bolt layout, is characterized in that, comprises the following steps:
1) quantity and the spacing of machine anchor bolt are set;
2) worktable and workpiece are placed into lathe bed diverse location, the deflection of worktable intermediate point when evaluation work platform and workpiece are in lathe bed each position, choose again worktable and workpiece in lathe bed each position time the maximum deformation quantity of worktable intermediate point and least amount of deformation, the result of then being subtracted each other by maximum deformation quantity and the least amount of deformation of worktable intermediate point when worktable and workpiece are in lathe bed each position is as the straightness error δ of lathe bed transverse axis axial-movement;
3) with the straightness error δ of lathe bed transverse axis axial-movement for objective function, with the spacing of foot bolt and quantity for independent variable is optimized, the straightness error δ of lathe bed transverse axis axial-movement minimum time corresponding anchor bolt pitch and quantity, time then minimum according to the straightness error δ of lathe bed transverse axis axial-movement, corresponding anchor bolt pitch and quantity carry out the layout of machine anchor bolt.
2. the optimization method of machine anchor bolt layout according to claim 1, is characterized in that, step 3) in the spacing of foot bolt comprise along the spacing in rail length direction and the spacing along lathe bed Width.
3. the optimization method of machine anchor bolt layout according to claim 1, is characterized in that, step 2) in by the deflection of worktable intermediate point when the method evaluation work platform of finite element simulation and workpiece are in lathe bed each position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510191344.XA CN104794280B (en) | 2015-04-21 | 2015-04-21 | A kind of optimization method of machine anchor bolt layout |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510191344.XA CN104794280B (en) | 2015-04-21 | 2015-04-21 | A kind of optimization method of machine anchor bolt layout |
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| Publication Number | Publication Date |
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| CN104794280A true CN104794280A (en) | 2015-07-22 |
| CN104794280B CN104794280B (en) | 2018-04-27 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0250118A (en) * | 1988-05-02 | 1990-02-20 | Ricoh Co Ltd | Zoom lens |
| CN103810349A (en) * | 2014-02-28 | 2014-05-21 | 江苏齐航数控机床有限责任公司 | Butt joint leveling method of long lathe body |
| CN104239624A (en) * | 2014-09-05 | 2014-12-24 | 西安交通大学 | Optimal design method for internal structure of machine tool body |
-
2015
- 2015-04-21 CN CN201510191344.XA patent/CN104794280B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0250118A (en) * | 1988-05-02 | 1990-02-20 | Ricoh Co Ltd | Zoom lens |
| CN103810349A (en) * | 2014-02-28 | 2014-05-21 | 江苏齐航数控机床有限责任公司 | Butt joint leveling method of long lathe body |
| CN104239624A (en) * | 2014-09-05 | 2014-12-24 | 西安交通大学 | Optimal design method for internal structure of machine tool body |
Non-Patent Citations (3)
| Title |
|---|
| 李波: "《基于变形控制的涂胶机器人结构优化设计》", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 苏渤: "《基于有限元分析的机床结构优化设计》", 《精密制造与自动化 》 * |
| 韩泽光: "《基于多目标遗传算法的汽车起重机回转支承螺栓组联接优化设计》", 《机电产品开发与创新》 * |
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Effective date of registration: 20200618 Address after: 402160 Chongqing City, Yongchuan Avenue, No. 1 star (Chongqing Yongchuan Industrial Park, Phoenix Lake Industrial Park) Patentee after: Chongqing smart equipment Co.,Ltd. Address before: 710049 Xianning West Road, Shaanxi, China, No. 28, No. Patentee before: XI'AN JIAOTONG University |
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